Modelling and measurement of airflow and aerosol particle distribution in a ventilated two-zone chamber

Lu, Wen-Hsiang; Howarth, A; Adam, Nor Maria; Riffat, Saffa

doi:10.1016/0360-1323(96)00019-4

Cited by 122 publications

(103 citation statements)

References 6 publications

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“…Generally, those simulations agree well with experimental data, although remarkable discrepancies exist in some studies. If the particle motion and dispersion history is of interest, the Lagrangian method is more attractive (Lu et al, 1996;Zhang and Chen 2004;Zhao et al, 2004b). By tracking and analyzing a large number of trajectories, these studies successfully predicted the particle dynamics and the temporal development of particle dispersion.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurements and numerical simulations of particle transport and distribution in ventilated rooms

Zhang

Chen

2006

Atmospheric Environment

297

176

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Prediction of particle dispersion and distribution in a room is very important for creating and maintaining a healthy indoor environment. The present study used a CFD program with a Lagrangian particle tracking method to predict particle dispersion and concentration distribution in ventilated rooms. Since the Lagrangian method could generate great uncertainty in particle concentration calculations, this study first investigated such uncertainty using a statistical approach. It was found that the stability of the concentration solution became well controlled as a sufficient number of particles were analyzed. Although the overall computational cost was considerable, the numerical results agreed well with associated experimental data. In all cases studied, particle size distribution was monodisperse, and particle diameter ranged from 0.31 to 4.5 μm. Particle deposition rate was neglected, and particles were hence removed only by the ventilation system. Thus the particle removal performance of different ventilation systems can be evaluated. Three ventilation systems have been studied, including ceiling and side wall supply systems and an underfloor air distribution (UFAD) system. It was found that the UFAD system had a better particle removal performance than the ceiling and side wall supply systems in the study. However, resuspended particles at the floor level can still cause problems in an underfloor air distribution system.

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Section: Introductionmentioning

confidence: 99%

Experimental measurements and numerical simulations of particle transport and distribution in ventilated rooms

Zhang

Chen

2006

Atmospheric Environment

297

176

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“…The reliability of the model was verified by the experimental data of Lu et al [21]. The case of virus outbreak in a zone and diffusion in the whole room was simulated.…”

Section: Model Verificationmentioning

confidence: 77%

Transportation and Risk Analysis of Influenza Indoor and Outdoor Transportation and Exposure Risk Analysis of Influenza Aerosol

Liu

You

2011

Indoor and Built Environment

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With the frequent outbreak of influenza virus in urban areas, the ecological security of high-density housing is becoming increasingly prominent. An Eulerian-Lagrangian pollutant diffusion model based on Large Eddy Simulation (LES) is established to simulate the transport of airborne virus. After the reliability of the numerical model is validated by the indoor experiment, the indoor and outdoor dispersion of microbial aerosol are simulated. The exposure risk is further studied based on the space-time concentration of pathogenic microorganisms of numerical simulation. The outcome can provide evidences for building plan optimization, environmental risk analysis and safety withdrawal planning.

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“…Hence, the solutions of these models are limited to mildly open channels with no separation or vortices. To date, these numerical methods, based on the recognized SIMPLE and/or SIMPLEC algorithms of the velocity-pressure correction, are successfully used to the study of the various flows without free-surface (Lu et al , 1997(Lu et al , 1999(Lu et al , 2002So and Lu 2001 etc. ), but rare for free-surface flow, which addresses extensive challenge to CFD researchers.…”

Section: Introductionmentioning

confidence: 99%

A numerical analysis of free-surface flow in curved open channel with velocity?pressure-free-surface correction

Zhang

Cui

et al. 2004

Computational Mechanics

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This paper presents a numerical study on free-surface flow in curved open channel. An improved SIMPLEC algorithm with velocity-pressure-free-surface coupled correction is developed and validated. Such algorithm differs from the traditional SIMPLEC algorithm and includes three correction equations which are named as the velocity correction equation, the freesurface correction equation derived from the continuity equation with the kinematic boundary conditions on the free-surface and the bottom bed, and the pressure correction equation taking the same formulation as the traditional SIMPLEC algorithm does. In this study, the improved method is used to solve the incompressible, three-dimensional, Reynolds-averaged Navier-Stokes equation set combined with the standard k-e model and/ or the low Reynolds number k-e model for free-surface viscous flow in curved open channels. The power law scheme (POW) is used to discretize the convection terms in these equations with a finite-volume method. The practical cases studied are free-surface flow through the 180 curved open channel with different hydraulic discharge rates. The comparisons between computations and experiments reveal that the model is capable of predicting the detailed velocity field, including changes in secondary motion, the distribution of bed shear, and the variations of flow depth in both the transverse and the longitudinal directions. In summary, the improved SIMPLEC algorithm is feasible and effective for numerical study of free-surface viscous flows in curved open channels.

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Modelling and measurement of airflow and aerosol particle distribution in a ventilated two-zone chamber

Cited by 122 publications

References 6 publications

Experimental measurements and numerical simulations of particle transport and distribution in ventilated rooms

Experimental measurements and numerical simulations of particle transport and distribution in ventilated rooms

Transportation and Risk Analysis of Influenza Indoor and Outdoor Transportation and Exposure Risk Analysis of Influenza Aerosol

A numerical analysis of free-surface flow in curved open channel with velocity?pressure-free-surface correction

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